Northwest Ohio, or Northwestern Ohio, consists of multiple counties in the northwestern corner of the US state of Ohio. This area borders Lake Erie, Southeast Michigan, and northeastern Indiana. Some areas are also considered the Black Swamp area. The Toledo metropolitan area is part of the region. Northwest Ohio's population in 2000 was 1,639,144 and is declining, specifically in the northern regions (counties shaded in the darker blue and Allen County). However, southern areas, such as Marion and Morrow Counties, and the City of Findlay are growing. Largest municipalities Toledo is the principal city of Northwest Ohio. Most of the region's television channels and radio stations are licensed in Toledo, Perrysburg or nearby Bowling Green. Though Toledo is an industrial city, Northwest Ohio is primarily agricultural with small centers of commerce distributed across region. Since the 1970s, the population of Lucas County and the Toledo metropolitan area has declined, though Wood and Hancock counties have had moderate population growth. Places considered within northwest Ohio These places are or may be classified as being in Northwestern Ohio, depending on the definition being applied: Counties and county seats Other cities, villages, and townships If a city is a county seat, it has been listed above according to the county in which it lies. Many of the cities, townships, and villages in Northwest Ohio are clustered in the Toledo MSA. This list is incomplete. Cities Villages Townships Toledo area townships Monclova Township Perrysburg Township Springfield Township Sylvania Township Washington Township Other places Nankin Nova Sullivan Ridgeville Extreme Northwest Ohio Extreme Northwest Ohio, or Far Northwestern Ohio, is a portion of Northwest Ohio best known as the Great Black Swamp area due to its natural history. The counties of Defiance, Fulton, Henry, Paulding, Putnam, Van Wert, and Williams in the state of Ohio are usually classified as Extreme Northwest Ohio. According to the 2000 Census, the population of this portion of NW Ohio is 234,660. When Allen and Hancock counties are included, the population is 414,428. Just like any other region, there is no universally agreed-upon line for Northwestern Ohio, as the entire area is defined differently by the opinions of multiple people. Principal Cities Transportation Airports Toledo Express Airport (TOL), in suburban Swanton, is the largest airport in northwest Ohio. Toledo Express is served by seven major passenger airlines, and has been named one of the five best small airports in the Midwest.